/* eslint-disable */
var XLSXStyle = XLSX;
function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = 0; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C];
      var colspan = cell.getAttribute('colspan');
      var rowspan = cell.getAttribute('rowspan');
      var cellValue = cell.innerText;
      if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;

      //Skip ranges
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });

      //Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1;
        colspan = colspan || 1;
        ranges.push({
          s: {
            r: R,
            c: outRow.length
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1
          }
        });
      };

      //Handle Value
      outRow.push(cellValue !== "" ? cellValue : null);

      //Handle Colspan
      if (colspan)
        for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
};

function datenum(v, date1904) {
  if (date1904) v += 1462;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  };
  for (var R = 0; R != data.length; ++R) {
    for (var C = 0; C != data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R;
      if (range.s.c > C) range.s.c = C;
      if (range.e.r < R) range.e.r = R;
      if (range.e.c < C) range.e.c = C;
      var cell = {
        v: data[R][C]
      };
      if (cell.v == null) continue;
      var cell_ref = XLSXStyle.utils.encode_cell({
        c: C,
        r: R
      });

      if (typeof cell.v === 'number') cell.t = 'n';
      else if (typeof cell.v === 'boolean') cell.t = 'b';
      else if (cell.v instanceof Date) {
        cell.t = 'n';
        cell.z = XLSX.SSF._table[14];
        cell.v = datenum(cell.v);
      } else cell.t = 's';

      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSXStyle.utils.encode_range(range);
  return ws;
}

function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook();
  this.SheetNames = [];
  this.Sheets = {};
}

function s2ab(s) {
  var buf = new ArrayBuffer(s.length);
  var view = new Uint8Array(buf);
  for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
  return buf;
}

function multiarr(arr) { // 是否为二维数组
  for (i = 0, len = arr.length; i < len; i++)
    if (arr[i] instanceof Array) return true;
  return false;
}

export function export_table_to_excel(id) {
  var theTable = document.getElementById(id);
  var oo = generateArray(theTable);
  var ranges = oo[1];

  /* original data */
  var data = oo[0];
  var ws_name = "SheetJS";

  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges;

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  });

  saveAs(wbout, `test.xlsx`)
}

export function export_json_to_excel({
  header,
  data,
  filename,
  autoWidth = true,
  bookType = 'xlsx',
  merges = null,
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  if (merges) {
    for (let i = header.length - 1; i >= 0; i--) {
      data.unshift(header[i])
    }
  } else {
    data.unshift(header)
  }
  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);
  // let merges = [{ s: { r: 0, c: 0 }, e: { r: 0, c: 5 } }, { s: { r: 0, c: 6 }, e: { r: 0, c: 10 } }, { s: { r: 0, c: 11 }, e: { r: 0, c: 17 } }]
  if (merges) {
    for (let merge of merges) {
      if (!ws['!merges']) ws['!merges'] = [];
      ws['!merges'].push(merge);
    }
  }

  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    const colWidth = data.map(row => row.map(val => {
      /*先判断是否为null/undefined*/
      if (val == null) {
        return {
          'wch': 10
        };
      } else if (val.length > 200) {//处理电子交接班时交班内容过长导致无法正常查看
        return {
          'wch': 70
        };
      }
      /*再判断是否为中文*/
      else if (val.toString().charCodeAt(0) > 255) {

        return {
          'wch': val.toString().length * 2
        };
      } else {
        return {
          'wch': val.toString().length
        };
      }
    }))
    /*以第一行为初始值*/
    let result = colWidth[0];

    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]['wch'] < colWidth[i][j]['wch']) {
          result[j]['wch'] = colWidth[i][j]['wch'];
        }
      }
    }
    ws['!cols'] = result;
  }

  // cell styles, only works with pro version
  var range = XLSXStyle.utils.decode_range(ws['!ref']);
  let alignment = {
    horizontal: "center",
    vertical: "center",
    wrapText: 1,
    indent: 0
  }
  let border = { //单元格外侧框线
    top: {
      style: 'thin',
    },
    bottom: {
      style: 'thin',
    },
    left: {
      style: 'thin',
    },
    right: {
      style: 'thin',
    }
  }
  for (var R = range.s.r; R <= range.e.r; ++R) {
    for (var C = range.s.c; C <= range.e.c; ++C) {
      var cell_address = { c: C, r: R };
      /* if an A1-style address is needed, encode the address */
      var cell_ref = XLSXStyle.utils.encode_cell(cell_address);
      if (ws[cell_ref]) {
        ws[cell_ref].s = {
          border: border,
          alignment: alignment
        }

      }
    }
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSXStyle.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  });

  saveAs(wbout, `${filename}.${bookType}`)
}

function saveAs(wbout, name) {
  const data = new Blob([s2ab(wbout)], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
  const link = document.createElement('a');
  link.href = window.URL.createObjectURL(data);
  link.download = name;
  link.click();
}


// 注释掉
// if (merges) {
//   for (let i = header.length-1; i >= 0; i--) {
//     data.unshift(header[i])
//   }
// } else {
//   data.unshift(header)
// }
// 改成
// data.unshift(header)
export function export_json_to_excel2({
  header,
  data,
  filename,
  autoWidth = true,
  bookType = 'xlsx',
  merges = null,
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  data.unshift(header);
  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);
  // let merges = [{ s: { r: 0, c: 0 }, e: { r: 0, c: 5 } }, { s: { r: 0, c: 6 }, e: { r: 0, c: 10 } }, { s: { r: 0, c: 11 }, e: { r: 0, c: 17 } }]
  if (merges) {
    for (let merge of merges) {
      if (!ws['!merges']) ws['!merges'] = [];
      ws['!merges'].push(merge);
    }
  }

  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    const colWidth = data.map(row => row.map(val => {
      /*先判断是否为null/undefined*/
      if (val == null) {
        return {
          'wch': 10
        };
      }
      /*再判断是否为中文*/
      else if (val.toString().charCodeAt(0) > 255) {
        return {
          'wch': val.toString().length * 2
        };
      } else {
        return {
          'wch': val.toString().length
        };
      }
    }))
    /*以第一行为初始值*/
    let result = colWidth[0];
    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]['wch'] < colWidth[i][j]['wch']) {
          result[j]['wch'] = colWidth[i][j]['wch'];
        }
      }
    }
    ws['!cols'] = result;
  }

  // cell styles, only works with pro version
  var range = XLSXStyle.utils.decode_range(ws['!ref']);
  for (var R = range.s.r; R <= range.e.r; ++R) {
    for (var C = range.s.c; C <= range.e.c; ++C) {
      var cell_address = { c: C, r: R };
      /* if an A1-style address is needed, encode the address */
      var cell_ref = XLSXStyle.utils.encode_cell(cell_address);
      if (ws[cell_ref]) {
        ws[cell_ref].s = {
          alignment: {
            horizontal: "center",
            vertical: "center"
          }
        }
      }
    }
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  });

  saveAs(wbout, `${filename}.${bookType}`)
}
